Fabrication and characterization of ultra-low noise narrow and wide band Josephson parametric amplifiers

Huang Keqiang^{1, 3}, Guo Qiujiang², Song Chao², Zheng Yarui¹, Deng Hui¹, Wu Yulin^{1, 4}, Jin Yirong¹, Zhu Xiaobo^{1, 4, †}, Zheng Dongning^{1, 3, ‡}

(color online) (a), (c) The frequency dependence of gain and noise; (b), (d) the signal power dependence of gain and noise.